Power transmission apparatus, method for controlling power transmission apparatus, and recording medium

Abstract

A power transmission apparatus wirelessly communicates with a power reception apparatus using an antenna, wirelessly transmits power to the power reception apparatus using the antenna, measures, in a period during which the transmission of the power is stopped, one or both of a voltage and a current output from the antenna, performs, based on a measurement result obtained by the measurement, a determination process for determining that an object different from the power reception apparatus is present, restricts, in a case where it is determined that an object different from the power reception apparatus is present as a result of the determination process performed by the first determination unit, the transmission of the power, and controls the first determination unit not to use in the determination process the measurement result obtained by the measurement in a period during which communication is performed.

What is claimed is: 
     
       1. A power transmission apparatus comprising:
 a negotiation unit configured to negotiate with a power reception apparatus; 
 a power transmission unit configured to wirelessly transmit power to the power reception apparatus in a power transfer phase after the negotiation; 
 a detection unit configured to perform a detection process for detecting a foreign object in the power transfer phase; and 
 a transmission unit configured to transmit, to the power reception apparatus, information representing a negotiable power in a case where the foreign object is detected in the power transfer phase, 
 wherein the power transmission unit stops a power transfer in a case where the detection unit detects the foreign object in the power transfer phase and it is determined that renegotiation with the power reception apparatus is not possible. 
 
     
     
       2. The power transmission apparatus according to  claim 1 , wherein the transmission unit transmits the information in a case where the foreign object is detected and it is determined that renegotiation with the power reception apparatus is possible. 
     
     
       3. The power transmission apparatus according to  claim 1 , wherein the detection unit performs the detection process based on power loss. 
     
     
       4. The power transmission apparatus according to  claim 1 , wherein the detection unit performs the detection process based on a quality factor. 
     
     
       5. A method for a power transmission apparatus, the method comprising:
 negotiating with a power reception apparatus; 
 wirelessly transmitting power to the power reception apparatus in a power transfer phase after the negotiation; 
 performing a detection process for detecting a foreign object in the power transfer phase; and 
 transmitting, to the power reception apparatus, information representing a negotiable power in a case where the foreign object is detected in the power transfer phase, 
 wherein a power transfer is stopped in a case where the foreign object is detected in the power transfer phase and it is determined that renegotiation with the power reception apparatus is not possible. 
 
     
     
       6. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a method for a power transmission apparatus, the method comprising:
 negotiating with a power reception apparatus; 
 wirelessly transmitting power to the power reception apparatus in a power transfer phase after the negotiation; 
 performing a detection process for detecting a foreign object in the power transfer phase; and 
 transmitting, to the power reception apparatus, information representing a negotiable power in a case where the foreign object is detected in the power transfer phase, 
 wherein a power transfer is stopped in a case where the foreign object is detected in the power transfer phase and it is determined that renegotiation with the power reception apparatus is not possible. 
 
     
     
       7. The power transmission apparatus according to  claim 1 ,
 wherein the detection process includes a first detection process for detecting a foreign object based on power loss and a second detection process for detecting a foreign object based on a quality factor, and 
 wherein, in a case where the detection unit detects the foreign object through at least one of the first detection process and the second detection process, the transmission unit transmits the information.